Day: February 6, 2015

If you find yourself glued to social media and also wish to know Morse code… we can think of no better invention to help hone your skills than the Twitter Telegraph. This vintage to pop culture mashup by [Devon Elliott] is a recent project that uses a sounder from the 19th century to communicate incoming tweets with dots and dashes.

Back in the day when everyone was connected by wire, the sounder was a device on the receiving end of the telegraph which translated the incoming signal to an audible clicking. Two tall coils sat with a metal tab teetering between them. When electricity surged into one of the coils it would magnetize, pulling the tab downward in a pattern which mimicked the incoming current sent from the other end. [Devon] decided to liberate the sounder from its string-and-two-can origins and use a more modern source of input. By adding a FONA board which comes equipped with a SIM card, the device was capable of connecting and receiving data from the Internet. An Arduino is responsible for taking the data received and translating it into Morse code using the Mark Fickett’s Arduinomorse library, and then sending it out through an I/O pin to the sounder itself to be tapped.

The finished project is connected to a cellular network which it uses to receive SMS messages and tweets. By mentioning the handle @ldntelegraphco you can send the Twitter Telegraph your own message which will be tapped in code for everyone in the vicinity to hear… which is worth giving a try for those of you curious types. Lastly, if you have an interest in taking a look at the code for your own use, it is available on [Devon’s] github.

There have been quite a few DIY pick and place projects popping up recently, but most of them are limited to conceptual designs or just partially working prototypes. [Juha] wrote in to let us know about his project, LitePlacer, which is a fully functional DIY pick and place machine with working vision that can actually import BOMs and place parts as small as 0402 with pretty good accuracy.

While some other DIY pick and place setups we’ve featured use fairly exotic setups like delta bots, this machine is built around typical grooved bearings and extruded aluminum. The end effector includes a rotating vacuum tip and a camera mounted alongside the tip. The camera provides feedback for locating fiducials and for finding the position of parts. Instead of using feeders for his machine, [Juha] opted to pick parts directly from pieces of cut tape. While this might be inconvenient if you’re placing large quantities of a single part, it helps keep the design simple.

The software that runs the machine is pretty sophisticated. After a bit of configuration it’s able to import a BOM with X/Y information and start placing within seconds. It also uses the camera to calibrate the needle, measure the PCB using the fiducials, and pinpoint the location of cut tape sections.

If you want to build your own machine, [Juha] published detailed instructions that walk you through the entire assembly process. He’s also selling a kit of parts if you don’t want to source everything yourself. Check out the video after the break to see the machine import a BOM and place some parts (all the way down to 0402).

Of all the vintage chiptune machines out there, the Commodore 64 is the most famous. Even 30 years later, there are still massive gatherings dedicated to eeking out the last cycle of processing power and graphics capability from the CPU and the infamous synth-on-a-chip, the SID. [Bob] wanted to build a SID jukebox. A C64 is capable of the job, but if you want to have every SID composition on an SD card and connect that to a network, a Raspberry Pi is the way to go.

The SID chip, in its 6581 or 8580 versions, is controlled directly by poking registers on the chip through the address and data busses. This means a lot of pins, too many for the original Raspi expansion header. That’s not a problem that can’t be solved with a few shift registers, though. The rest of the circuit is an LM386 audio amplifier, an LCD that displays the current song, and a can crystal oscillator for the SID.

Right now everything is wired up on a breadboard, but making this a Raspberry Pi hat would be a rather simple proposition. It’s only a matter of finding a SID with working filters, and if you can manage that, it’s a pretty easy build to replicate. Video below.

Minecraft hit the PC gaming scene as an alpha release on May 17, 2009. Something about the open world, the crafting system, and the various modes of gameplay made it an instant hit. Since then Minecraft become one of the best selling video games of all time, inspiring thousands of hacks, mods, and projects. This week’s Hacklet highlights some of the best Minecraft projects on Hackaday.io!

We start with [Toulon] and his MineCraft Sidecar Keypad. The Mystify Claw was originally designed as an alternative input device for First Person Shooter (FPS) games. It may look like a mouse, but the claw has no balls or lasers. It provides a 10 button “cradle” for the left hand. Some folks liked the claw, but for many it quickly became a dust collector. [Toulon] resurrected this old input device as an awesome Minecraft controller. He started by yanking all the old electronics, replacing the claw’s brain with the Teensy 2.0, a favorite of keyboard hackers everywhere. New buttons and a slew of new Teensy code made things perfect for mining.

Next up is [Thomas] and his Raspberry Minecraft Server. The Raspberry Pi has long been a hacking platform for Minecraft. The official Raspberry Pi edition of Minecraft is easy to get running, and great for hours of fun. You can also run a Minecraft server on the Pi, which is exactly what [Thomas] is doing. He’s set his Raspberry Pi up with a WiFi dongle and a battery pack. With a bit of configuration, this allows the Pi to become the center of a wireless Lan party. On batteries, the Pi will run for about five hours of continuous gaming. Details for [Thomas’] project are a bit light right now, but that’s only because he just literally started documenting and uploading his project as we’re going to press. Give him a few days and he’ll have everything filled in!

[GPPK] brings a bit of Minecraft into the real world with Full Size Wireless Redstone Lamp. Inspired by smaller models of the Minecraft redstone lamp, [GPPK] decided to build a life-sized version. “Life-sized” in this case is about 1 cubic meter. That’s a BIG lamp! [GPPK] designed the shell of the lamp in Sketchup, and cut the sides out using a gantry style CNC machine. The structure will be held together with 3D printed connectors, while a Raspberry Pi will provide the brains. Turning the lamp on will be as simple as turning on a switch in-game in Minecraft. [GPPK] has been a bit slow lately with updates on the project. If you know [GPPK] let ’em know that we’re anxiously awaiting some info!

Finally, we have [Simon] and Raspberry Pi Python Controller. One of the best ways to get kids hooked on hacking and electronics is to show them how simple circuits can lead to big changes. What better way to do that than wiring up a simple push button controller for Minecraft? [Simon] used an Arduino paired to a Raspberry Pi with a serial over USB connection. Buttons wired to the Arduino are sent through the serial link to the Pi, where a python script fires off actions based on the serial data. [Simon] has tested his script with Mincraft Pi Edition, and is happy to report back that it works great.

Do you know what’s missing from this Hacklet? Your Minecraft project! It’s not too late though – upload your info to Hackaday.io, and we might just add it to our brand new Minecraft Projects List!

Well, it’s just about quitting time here in the Hackaday Mine. As long as the creepers don’t get us, we’ll be back next week. Same hack time, same hack channel, bringing you the best of Hackaday.io!

Bryan is a computer neophyte (he needs help turning his computer on), but he has a basketball story. His team was playing in a crucial basketball playoff game at the club. They were down by two late in the game and he just couldn’t get one of his players to play defense. This player was a great shooter and that is about it — burying a three that put the team up for the first time. After sinking it he just stood there admiring his masterpiece while Bryan screamed at him to get back on defense (he rarely played D and he didn’t that game either). Instead, he flat lined and went down on his face– heart attack!

Of course that player was me and that was an awful day. But I’m still around to tell the story… as a hardware designer years before I didn’t know that I’d bet everything on one particular project.

For their ECE 4760 final project at Cornell, [Varun, Hyun, and Madhuri] created a real-time sound spectrogram that visually outputs audio frequencies such as voice patterns and bird songs in gray-scale video to any NTSC television with no noticeable delay.

The system can take input from either the on-board microphone element or the 3.5mm audio jack. One ATMega1284 microcontroller is used for the audio processing and FFT stage, while a second ‘1284 converts the signal to video for NTSC output. The mic and line audio inputs are amplified individually with LM358 op-amps. Since the audio is sampled at 8KHz, a low-pass filter gets rid of frequencies above 4KHz.

After the break, you can see the team demonstrate their project by speaking and whistling bird calls into the microphone as well as feeding recorded bird calls through the line input. They built three controls into the project to freeze the video, slow it down by a factor of two, and convert between linear and logarithmic scales. There are also short clips of the recorded bird call visualization and an old-timey dial-up modem.

Steampunk extraordinaire [Jake von Slatt] has released his latest creation. This time he’s built a Wimshurst machine from mostly 3D printed parts. The Wimshurst machine is an electrostatic generator and was originally invented in the late 1800’s by James Wimshurst. It uses two counter-rotating disks to generate an electrostatic charge which is then stored in two Leyden jars. These jars are also connected to a spark gap. When the voltage raises high enough, the jars can discharge all at once by flashing a spark across the gap.

[Jake’s] machine has a sort of Gothic theme to it. He designed the parts using Autodesk’s 123D Design. They were initially printed in PLA. Skate bearings were used in the center of the disks to ensure a smooth rotation. The axle was made from the fiberglass shaft of a driveway reflector. The vertical supports were attached the base with machine screws.

The Leyden jars were made from sections of clear plastic tube. The caps for the jars were 3D printed and are designed to accept a short length of threaded 1/8″ pipe. Copper wire was used for the interior contacts and are held in place with electrical tape. The metal sectors on each disk were made from pieces of cut aluminum tape.

You may be wondering how this machine works if it’s almost entirely made out of plastic. [Jake] actually painted most of the parts with a carbon paint. This makes them electrically conductive and he can then use the parts to complete electrical circuits. Unfortunately he found this to be rather ineffective. The machine does work, but it only produces sparks up to 1/2″ in length. For comparison, his other machine is capable of 6″ sparks using similar sized Leyden jars.

[Jake] actually tried rebuilding this project using ABS, thinking that the PLA may have been collecting moisture from his breath, but the result is still only 1/2″ sparks. He suspects that the bumpy surface of the plastic parts may be causing the charge to slowly leak away, preventing a nice build up. He’s released all of his designs on Thingiverse in case any other hackers want to give it a whirl.